Tips and Tricks - Written by mbrocks.com on Tuesday, May 8, 2007 16:07 - 4 Comments

TCP Settings for HSDPA

In order to hit the higher speeds using HSDPA, you need to ensure that Windows is configured optimally. Specifically, you need to ensure that your TCP settings are up to scratch. Here’s a quick run down of the right settings to get you up to those higher data rates – these settings will be good up to 7.2Mbps

You’ll need to change the settings the in the registry. If you don’t know a. what the registry is, b. what TCP is or c. what the capital of Bhutan is, then this hack isn’t for you. If in doubt, don’t do it.

Disclaimer over. So the keys you need to tinkle with are in:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

For all devices, or if you just want to change the settings for individual devices, they’re held in:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces

The optimal settings for high speed operation are:

TCPWindowSize 183960 Byte
GlobalMaxTcpWindowSize 183960 Byte
Tcp1323Opts 1
SackOpts 1
DefaultTTL 128

This only applies to Windows 2000 and XP – Windows Vista is apparently smart enough to change it’s TCP settings on the fly.

Enjoy.






4 Comments

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Jose Leon
Nov 2, 2007 16:18

Great post :)

One question: these values are not by defect in Windows Xp registry, so we must add it manually. But what is the type of new value to create these settings?

Thanks.

JoseLeon
Nov 21, 2007 6:02

There is a new version in Vodafone German website:

http://www.vodafone.de/hilfe-support/technischer-support/97001.html#rights

I have translated this webpage with google, you only need to accept clicking on the button and you will be able to download it.

JoseLeon
Nov 21, 2007 10:37

Sorry, I posted in the wrong section.

John
Mar 26, 2008 14:59

hi i cnt seem to find any of these values in my registry any help??

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